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protocol: increase HTLC precision to 1/1000 satoshi.

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This gets truncated for on-chain transactions (thus, rounding may
contribute to fees).

This also means we currently have an upper bound of 0.04 BTC per HTLC;
this can be increased later if required.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2015-09-24 15:00:47 +09:30
parent 58a62e782d
commit 5bc22f0368
13 changed files with 75 additions and 62 deletions
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10
pkt.c
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@@ -136,21 +136,25 @@ struct pkt *update_pkt(const tal_t *ctx,
{
Update u = UPDATE__INIT;
u.revocation_hash = sha256_to_proto(ctx, revocation_hash);
u.delta = delta;
u.delta_msat = delta * 1000;
return to_pkt(ctx, PKT__PKT_UPDATE, &u);
}
struct pkt *update_htlc_add_pkt(const tal_t *ctx,
const struct sha256 *revocation_hash,
u64 value,
u32 value,
const struct sha256 *htlc_rhash,
u32 abs_locktime_seconds)
{
UpdateAddHtlc u = UPDATE_ADD_HTLC__INIT;
Locktime l = LOCKTIME__INIT;
/* HTLC total must fit in 32 bits. */
if (value > (1ULL << 32) / 1000)
return NULL;
u.revocation_hash = sha256_to_proto(ctx, revocation_hash);
u.amount = value;
u.amount_msat = value * 1000;
u.r_hash = sha256_to_proto(ctx, htlc_rhash);
l.locktime_case = LOCKTIME__LOCKTIME_SECONDS;
l.seconds = abs_locktime_seconds;